Food sources for engineered spaceborne life forms

Years ago, I was tinkering around with the idea of an engineered life form which could survive the vacuum of space and be made into a starship. I have since given up on the idea, but curiosity is still there in case I find another use for the concept.

Setting aside the question of IF life can naturally occur in space since we are talking about engineered life forms, what would be a likely source of nutrition for space-faring, organic, lifeforms?

I'm imagining photosynthesis being a good start, but it needs a source of physical matter to provide sustenance, as well as something that can be turned into a means of propulsion.

Could the means to sustain and grow an organic life form be found within comets, asteroids, or stellar ice?

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Food sources for engineered spaceborne life forms

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